cis-ubuntu-14-04-lts-3-5-2-ensure-sctp-is-disabled

name	CIS Ubuntu 14.04 LTS - 3.5.2 Ensure SCTP is disabled
description	Verify that the SCTP protocol kernel module is disabled to reduce attack surface
category	cis-os-hardening
version	2.1.0
author	cyberstrike-official
tags	["cis","ubuntu","ubuntu-14.04","level-1","not-scored","network"]
cis_id	3.5.2
cis_benchmark	CIS Ubuntu Linux 14.04 LTS Benchmark v2.1.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	low

3.5.2 Ensure SCTP is disabled (Not Scored)

Profile Applicability

• Level 1 - Server
• Level 1 - Workstation

Description

The Stream Control Transmission Protocol (SCTP) is a transport layer protocol used to support message oriented communication, with several streams of messages in one connection. It serves a similar function as TCP and UDP, incorporating features of both. It is message-oriented like UDP, and ensures reliable in-sequence transport of messages with congestion control like TCP.

Rationale

If the protocol is not being used, it is recommended that kernel module not be loaded, disabling the service to reduce the potential attack surface.

Audit Procedure

Run the following commands and verify the output is as indicated:

modprobe -n -v sctp
# Expected: install /bin/true

lsmod | grep sctp
# Expected: <No output>

Expected Result

install /bin/true

And no output from lsmod | grep sctp.

Remediation

Edit or create the file /etc/modprobe.d/CIS.conf and add the following line:

install sctp /bin/true

Default Value

Not disabled by default.

References

• CIS Controls: 9.1 - Limit Open Ports, Protocols, and Services

Profile

• Level 1 - Server
• Level 1 - Workstation